[llvm] [SampleFDO] Stale profile call-graph matching (PR #92151)

[Lei Wang via llvm-commits]

wlei-llvm wrote:

Update:
- Changed to "real" call graph matching: processing the IR function in top-down order and run CG matching along under the same caller scope's CFG matching, run the matching while processing the LCS.
- add stats

https://github.com/llvm/llvm-project/pull/92151